Improve README.md with Installation and test scripts.

README.md

@@ -1,2 +1,34 @@
 # p2pix-smart-contracts
+
 Repository for P2Pix EVM contracts to be imported by the project.
+
+## Installation
+
+Import the repository on your app to allow use the artifacts for Ethers.
+
+```
+npm install --save git+https://github.com/doiim/p2pix-smart-contracts.git
+```
+
+To import artifacts on the project use the following:
+
+```
+import P2PIXArtifact from 'p2pix-smart-contracts/artifacts/contracts/p2pix.sol/P2PIX.json'
+```
+
+Then use a Contract instance to interact directly with it:
+
+```
+const p2pixContract = new ethers.Contract(address, P2PIXArtifact.abi, signer);
+```
+
+## Testing
+
+To run tests, clone this repo, install dependencies and run Hardhat tests.
+
+```
+git clone https://github.com/doiim/p2pix-smart-contracts.git
+cd p2pix-smart-contract
+npm install
+npx hardhat test
+```